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The STP BPDU begins with the protocol id field and the version id. I understand that the version is the type of the STP: 0 stands for STP,
2 for RSTP
and 3 for MSTP.
So what do we really need the protocol id field for? When will it not be 0?

Networking pup
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1 Answers1

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0 packet identifier is for IEEE 802.1D

When will it not be 0?

Packet identifier should be 1 in IEEE 802.1G

Nima Ghotbi
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  • I can barely find any information on IEEE 802.1G. All I found was: "A proposed standard for remote MAC bridging". Is it another anti-L2-loop protocol? – Networking pup Nov 17 '16 at 06:28
  • neither I haven't seen it in the wild , my point is that field is for forward compatibility – Nima Ghotbi Nov 17 '16 at 06:48